The Sweet Sound of Sewer Inspections 5 Cities Conference August 17, - - PowerPoint PPT Presentation

The Sweet Sound of Sewer Inspections

5 Cities Conference August 17, 2017

Presentation Goals

Share results from pilot programs Detail Impact to CMOM Program and steps taken to change the program

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Sound generator Sound receiver

What is Acoustic Inspection?

What is Acoustic Inspection?

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BUT FIRST….

I’m required to “briefly”talk about MSD

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• St. Louis MSD Statistics

Formed 1954 as Municipality of the State 525 square miles – City of St. Louis & 80% St. Louis County – 88 Municipalities + City of St. Louis & St. Louis County – Serve - 1.3 million (419,000 accounts) Responsibilities: – Collection & Treatment of Wastewater – Stormwater Management

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Operational Divisions

Collection System divided into 5 territories supported by 3 Yards

• 6550 miles of sanitary &

combined sewer

• 3000 miles of storm sewer
• 193,000 manholes
• 153,000 inlets

Pump Stations divided into 3 territories supported by 3 divisions

• 250 sanitary pump stations
• 26 Floodwall pump stations
• 130 miles of force mains

Treatment Plants

• 7 Plants
• 350 MGD average

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Collection System Assets

Collection System:

• 6550 miles of sanitary sewer
• 4750 miles Separate
• 1800 miles Combined
• 162,000 sanitary manholes
• 125,00 separate
• 37,000 combined

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Consent Decree – CMOM Program Dec. 2016

Manhole Inspections (16,200/yr) Manhole Rehabilitation (Rehab ratings of 4 or 5) Sewer System Cleaning (1000 miles) CCTV Inspection (280 miles/yr) Sewer Rehabilitation (90 miles/yr) Force Main Inspections Pump Station Inspections Service Level based program

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Sewer System Cleaning

< 21” Non-pvc – 5 year cycle < 21” PVC – 10 year cycle > 21” Clean as necessary

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Changing CMOM Program

2014 - acoustic inspection technology introduced to District

– How could be incorporate into our CMOM? – Started planning pilot program

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2015 Pilot Program

Rented instrument 3 months of data collection 443 sewer reaches inspected

– 15 miles of pipe (79,000’)

Self performed

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Inspection Process

Acoustically Inspect pipe CCTV pipe (approx. 20%) Clean pipe (hydro-flush or cobra saw) Acoustic Inspect again

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2015 Pilot Results

September 2015 semi-annual CD meeting

• Number of sewer reaches inspected – 443
• Length inspected – 79,239 feet

# of Reaches Feet – Rating = 0 25 7,171 – Rating = 1 20 5,254 – Rating = 2 11 2,395 – Rating = 3 12 2,766 – Rating = 4 15 3,574 – Rating = 5 45 9,913 – Rating = 6 40 8,066 – Rating = 7 60 10,351 – Rating = 8 115 14,913 – Rating = 9 85 11,086 – Rating = 10 25 3,750

Rating 0-5 128 reaches 31,072’ 39.2% of total

Next Steps

Agreed – Has Merit; More data needed Round 2

– Bigger and Better

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2016 Pilot Program

Purchased instrument 5+ months of data collection 100 mile target goal

– Combined/Separate Sewers – Verify rating that requires cleaning – Max pipe diameter

Self performed

– 2800+ man-hour effort

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2016 Pilot Results

September 2016 semi-annual CD meeting

• Total Inspections – 2,224

– Fronts (1,735) – Rears (489) – Non PVC Pipe (1,718) – PVC Pipe (506)

Sewer Rating WO Count Quantity (feet) Miles Percent WO 42 12670 2.40 1.90% 1 32 9780 1.85 1.44% 2 59 16892 3.20 2.66% 3 71 19823 3.75 3.21% 4 79 22650 4.29 3.57% 5 124 33502 6.35 5.60% 18.37% 6 169 42132 7.98 7.63% 7 200 44923 8.51 9.03% 8 593 108094 20.47 26.77% 9 763 146162 27.68 34.45% 10 83 19543 3.70 3.75% 2224 476171 90.18 100.00%

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2016 Pilot Results

September 2016 semi-annual CD meeting

Acoustic Rating Pipe Dia. 1 2 3 4 5 6 7 8 9 10 total 6 1 1 8 25 21 28 36 42 81 124 136 516 679 58 1746 10 1 1 4 4 6 6 7 13 17 3 62 12 13 7 23 22 18 28 21 16 32 19 10 209 15 2 7 8 14 8 17 10 23 33 7 129 16 4 1 1 1 1 2 10 18 1 3 6 10 4 24 21 1 3 1 5

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2016 Pilot Results

September 2016 semi-annual CD meeting Combined

Area

Sewer Rating WO Count Quantity (feet) Miles Percent WO 23 7551 1.43 6.93% 1 11 3699 0.70 3.31% 2 33 8786 1.66 9.94% 3 35 9412 1.78 10.54% 4 41 11167 2.11 12.35% 5 51 13299 2.52 15.36% 58.43% 6 50 11042 2.09 15.06% 7 30 5829 1.10 9.04% 8 34 2912 0.55 10.24% 9 20 1909 0.36 6.02% 10 4 277 0.05 1.20% 332 75883 14.37 100.00% WO Count Non Plastic 319 Plastic 13

High amounts of debris High # of connections Older

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2016 Pilot Results

September 2016 semi-annual CD meeting

New Separate Sewer Rating WO Count Quantity (feet) Miles Percent WO 8 1767 0.33 0.76% 1 5 724 0.14 0.48% 2 3 508 0.10 0.29% 3 5 965 0.18 0.48% 4 6 977 0.19 0.57% 5 9 1964 0.37 0.86% 3.44% 6 22 3763 0.71 2.10% 7 59 11216 2.12 5.63% 8 373 66270 12.55 35.59% 9 506 98387 18.63 48.28% 10 52 12200 2.31 4.96% 1048 198741 37.64 100.00% Old Separate Sewer Rating WO Count Quantity (feet) Miles Percent WO 11 3352 0.63 1.36% 1 16 5357 1.01 1.98% 2 23 7598 1.44 2.85% 3 30 9181 1.74 3.72% 4 32 10506 1.99 3.97% 5 61 17261 3.27 7.56% 21.44% 6 93 25865 4.90 11.52% 7 108 27162 5.14 13.38% 8 184 38416 7.28 22.80% 9 222 43010 8.15 27.51% 10 27 7066 1.34 3.35% 807 194774 36.89 100.00% WO Count Non Plastic 604 Plastic 444 WO Count Non Plastic 758 Plastic 49

Videos

– 9 Rating

• 8” VCP, 112 ft.

– 2 Rating

• 8” VCP, 330 ft.

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2016 Pilot Results

September 2016 semi-annual CD meeting

Combined – 58.43% New Separate – 3.44% Old Separate – 21.44% Total – 18.37%

• Investigations confirm that an inspection score of 6-10 indicates a clean sewer reach,

and a score of 0-5 indicates a sewer reach that should be cleaned

• Not recommended for Combined Sewer System based on large percentage of

inspections with a 5 or less rating

• Acoustic Inspection should only be used on 15” diameter pipe or less

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2016 Pilot Results

September 2016 semi-annual CD meeting

Recommendations

– No changes to combined sewer program – Acoustic inspect < 15” separate sewers, 6-year cycle

• 0 thru 5 acoustic rating, clean reach

– No changes for >15” or < 21” pipe

Next Steps

– Submit Formal Request

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Final Submittal Request

Combined System

– Clean on 5-year cycle, < 21” pipe

Separate System, < 15” pipe

– Acoustic Inspect on 6-year cycle – Clean 0 thru 5 rated pipe

Separate System, >15” to < 21”

– Clean on 6-year cycle

> 21” – Clean as necessary

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Math

Combined System < 21” pipe

• 940 miles Non-pvc
• 55 miles PVC

– Old CMOM Cleaning

• 188 miles Non-PVC
• 5.5 miles PVC
• Total: 193.5 miles

– New CMOM Cleaning

• 199 miles

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Math

Separate System < 21” pipe

• 2,341 miles Non-pvc
• 2,035 miles PVC

– Old CMOM Cleaning

• 468.2 miles Non-PVC
• 203.5 miles PVC
• Total: 671.7 miles

– New CMOM

• Acoustic < 15” (97.2% of Separate System)

– 709 miles (clean approx. 20% or 140 miles)

• Clean > 15” to < 21”(2.8% of Separate System)

– 20.4 miles

Approval

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Approval – December 2016 Purchase Equipment

– Acoustic units – Tablets – Repurpose fleet

Program CMMS

– Acoustic Inspection – Auto escalation

Train Employees

New Program

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Acoustic Inspection If pipe rating = 0-5: Clean If cleaning generates > 1 bucket debris: CCTV If CCTV scores 4 or 5: repair as necessary

Expectations

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Improved Safety Reduced Cost

– 40%of cleaning cost

Goals

– 4,000’ per day average – Reduced SSO’s & WBU’s

Year to Date Results

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Questions?

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www.ProjectClearSTL.org @ProjectClearSTL Project Clear STL Bberthold@stlmsd.com

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